Dave F.

Member
Just recently gotten an John Deere H, In the operator's manual it say's to use 40 Weight oil for temperatures between 65 to 90 degrees. Can't seem to find straight 40W oil in my area would it be ok. to use 20-50w oil? Thanks Dave F.
 
Tractor Supply sells SAE 40W in 5 gallon pails. It is high-detergent oil, just like any 15W-40 or 20W-50 is going to be. Any of these will work unless you engine is very dirty inside and you don't want to risk using HD oil.
 
On a side-note, 40W engine oil is the same thing as 90W gear/transmission oil. I bought a 5 gallon pail for the transmission in my Oliver-crawler. I did not notice until I got home that it is 40W HD (high detergent) so I cannot even use it in my transmission. I wish you were close-by. I'd let you have the 5 gallon pail. I am now using it for chainsaw bar-oil.

In my quest for 40W non-detergent engine oil - I wound up getting 90W Ford transmission oil (same thing).
 
I use Rotella 15-40 in my H and it does just fine. I use Valvoline 50 in the hydraulics to make it work like it is supposed to.
Richard in NW SC
 
20-50 is the perfect oil for warm temperatures and warm working engines. i use castrol 20-50 in my lawn mowers and quad and castrol 15-40 in my duramax.been using castol for about 35 years.
 
(quoted from post at 17:04:41 05/20/17) i sure dont see that 90w gear oil is the same as 40 wt engine oil.

Engine oil 40wt is the same viscosity as 90wt gear oil. It is also yellow metal safe .
 

Shell carries Rotella T1 straight weight oil for two stroke Detroits with the low ash SF-2 rating.

http://rotella.shell.com/products/rotella-t1.html
 
40 weight motor oil and 90 weight gear oil may be the same viscosity but have different additives. The additives in gear oil can have bad
effects on small moving parts of engine .
 
You "don't see?" Does that mean your are not "looking" or do you have some specifics to offer? 40W engine oil is the same viscosity as 90W gear oil. Pure SAE 40W motor oil (no additives) is the same thing as pure SAE 90W GL1 gear oil (no additives). Note I said "pure." The 40W I have here, either Shell Rotella or Traveler 40W from Tractor Supply DO have additives. The Ford SAE 90W transmission oil from Tractor Supply has no additives and is what I use in my Oliver crawler transmission (it is pure SAE 40W by engine-oil standards).

I have a 1996 New Holland/Ford/Shibaura diesel tractor that also calls for 40W engine oil when used in extreme conditions. So it is not all that ancient of a recommendation.
 
They only have additives if - they have additives. Pure SAE GL1 90W or pure SAE 40W have no additives.
 
You people that claim pure 40W is not the same as pure 90W? How about some facts.

API type SA 40W engine oil is pure with no additives and the viscosity is an engine-oil scale.

SAE 90 gear oil type GL1 is pure with no additives and the viscosity is on a gear-oil scale. 90W gear oil is the same thickness as 40W engine oil. Just two different rating systems, like celsius and fahreneheit.
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How is pure oil without additives an asset ? High pressure wear additives ain't gonna do harm to those old straight cut gears.
Advanatage if the pto shaft seal fails and allows transmission oil into the pto. The motor oil won't ruin the pto's wet clutch packs , sae 90 gear oil will damage wet clutch packs .
 
Big asset for my Clark transmission in my Oliver crawler. EP additives
will plug up the wet steering brake bands.

EP additives also lower the performance of some clutches in manual
transmission synchronizers.

Now engines? I assume the more additives the better IF the engine is
not all sludged up.
 

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